Why does the IIS application freeze while the same application works correctly in IIS Express and the localhost versions?

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There could be multiple reasons why an IIS application freezes while it works correctly in IIS Express and localhost versions. Some of the common reasons are:

1. Different configurations: IIS and IIS Express have different configurations and settings, and these differences may cause the application to behave differently. For example, IIS may have stricter security settings or a different version of .NET Framework than IIS Express.

2. Load balancing: In some cases, applications may work fine on localhost or IIS Express but struggle to handle traffic when deployed on IIS. This could be because IIS is configured to use load balancing, which can cause unexpected behavior if the application is not designed to handle it.

3. Connection timeouts: IIS may set shorter connection timeouts than IIS Express or localhost versions, which can cause the application to freeze if it takes too long to respond.

4. Memory limitations: IIS has a different memory limitation than IIS Express, and if the application is memory-intensive, it may freeze when deployed on IIS.

5. Permissions: IIS may require different permissions than IIS Express or localhost versions, and if the application doesn't have the right permissions, it may fail or freeze on IIS.

To troubleshoot the issue, it is advisable to check the IIS logs and event logs, monitor the application's resource usage, and compare the configurations of the different environments.